Datasheet > AAT3123A

AAT3123A

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
ANALOGICTECH		泵
页数	文件大小	规格书
18页	317K
描述
High Efficiency 1X/1.5X Fractional Charge Pump for White LED Applications

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AAT3123A 数据手册

AAT3123/23A/24

High Efficiency 1X/1.5X Fractional Charge

Pump for White LED Applications

™

ChargePump

General Description

Features

The AAT3123/23A/24 is a low noise, constant fre-

quency charge pump DC/DC converter that uses a

dual mode load switch (1X) and fractional (1.5X)

conversion to maximize efficiency for white LED

applications. The device can be used to produce

current levels up to 20mA to drive up to six LEDs

from a 2.7V to 5.5V input. Outputs may be operat-

ed individually or paralleled for driving higher-cur-

rent LEDs. A low external parts count (two 1µF fly-

ing capacitors and two small 1µF capacitors at V_IN

and OUT) make the AAT3123/23A/24 ideally suited

for small battery-powered applications.

•

V_INRange: 2.7V to 5.5V

Dual Mode 1X and 1.5X Charge Pump for

Maximum Efficiency

Drives Low-V_Fand High-V_FType LEDs

Up to Six 20mA Outputs (AAT3124)

Up to Four 20mA Outputs (AAT3123/23A)

32-Position Logarithmic Scale with Digital

Control

•

Simple Serial Control (S²Cwire) Interface

Low Noise Constant Frequency Operation

1MHz Switching Frequency

Small Application Circuit

Regulated Output Current

Automatic Soft Start

No Inductors

I_Q<1µA in Shutdown

AnalogicTech’s Simple Serial Control™ (S²Cwire™)

interface is used to enable, disable, and set the

LED drive current with a 32-level logarithmic scale

LED brightness control. The AAT3123/23A/24 has a

thermal management system to protect the device

in the event of a short-circuit condition at the output

pin. Built-in soft-start circuitry prevents excessive

inrush current during start-up. A high charge pump

switching frequency enables the use of very small

external capacitors. A low-current shutdown feature

disconnects the load from V_INand reduces quies-

cent current to less than 1µA. The device also inte-

grates a test current/auto-disable feature for each

channel. The AAT3123/23A is available in a very

small, Pb-free 12-pin TSOPJW package. The six

output AAT3124 is available in a Pb-free 16-pin

4x4mm QFN package.

Temperature Range: -40°C to +85°C

12-Pin TSOPJW Package (AAT3123/23A)

16-Pin 4x4mm QFN Package (AAT3124)

Applications

•

Color (RGB) Lighting

Programmable Current Source

White LED Backlighting

White Photo Flash for DSCs

Typical Application

VIN

C1+

1µF

C1-

C2+

VOUT

V_BATTERY

C_IN

C_OUT

1µF

AAT3124

C2-

EN/SET

GND

3123.2005.12.1.4

12 3 4 5 6 7...18

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